"I personally don’t think a border wall is in and of itself immoral," he added.

However, Coons argued that the Trump administration's immigration policies that have led to the separation of migrant families and detainment of migrant children are "immoral."

.@ChrisCoons: "I agree with the advice that Lindsey Graham just gave to the President which is that he should reopen the government and we should spend several weeks negotiating over what we can all agree on. I personally don’t think that a border wall is in of itself immoral." pic.twitter.com/POfNzyncR0

Trump's demand for more than $5 billion in funding for the wall along the southern border has been at the heart of a partial government shutdown that has lasted more than three weeks. Democrats have refused to agree to money for the structure.

Democratic lawmakers have insisted that a wall would be ineffective at deterring illegal immigration, and that the money would be better spent on other border security measures. Some lawmakers have also said the structure does not represent American values.

Trump has responded to the latter argument by noting that the Vatican has a wall.